support custom things

files/bridge-post-scripts/post-up.sh.j2

@@ -22,7 +22,7 @@ replace_ip() {
   # 检查 $INPUT 是否包含点
   if [[ "$INPUT" == *.* ]]; then
     IFS='.' read -r -a INPUT_PARTS <<< "$INPUT"
-    PART_COUNT=${#INPUT_PARTS[@]}
+    PART_COUNT=${{'{#'}}INPUT_PARTS[@]}
     # 如果有 4 个或以上的部分，那么这是一个完整的 IP 地址，直接返回
     if [[ $PART_COUNT -ge 4 ]]; then
       echo "$INPUT"

files/interfaces.j2

@@ -15,6 +15,10 @@ iface lo inet loopback
 auto {{link.name}}
 iface {{link.name}} inet manual
 iface {{link.name}} inet6 manual
+{% if link.interfaces_custom is defined and link.interfaces_custom %}
+### custom
+{{link.interfaces_custom}}
+{% endif %}
 
 {% endfor %}
 {% endif %}
@@ -53,6 +57,10 @@ bond-updelay 200
 bond-lacp-rate fast
 bond-xmit-hash-policy {{ bond.hash_policy | default('layer2+3') }}
 {% endif %}
+{% if bond.interfaces_custom is defined and bond.interfaces_custom %}
+### custom
+{{bond.interfaces_custom}}
+{% endif %}
 
 {% endfor %}
 
@@ -144,6 +152,11 @@ provider ppp{{ppp.id}}
 # end PPPs
 {% endif %}
 
+{% if interfaces_custom is defined and interfaces_custom %}
+### custom
+{{interfaces_custom}}
+{% endif %}
+
 # end MyCard NextGen Router config file
 
 source /etc/network/interfaces.d/*